燒綠石（英語：Pyrochlore）是一類含鈮礦物，化學式可表示為Na,Ca)2Nb2O6(OH,F)。
| Pyrochlore | |
|---|---|
 Pyrochlore from Russia | |
| 基本資料 | |
| 類別 | Oxide mineral |
| 化學式 | (Na,Ca)2Nb2O6(OH,F) |
| 施特龍茨分類 | 4.DH.15 |
| 戴納礦物分類 | 08.02.01.01 燒綠石group |
| 晶體分類 | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| 晶體空間群 | Fd3m |
| 晶胞 | a = 10.41(6) Å, Z = 8 |
| 性質 | |
| 顏色 | Black to brown, chocolate-brown, reddish brown, amber-orange, red-orange |
| 晶體慣態 | Typically octahedra, disseminated granular, massive |
| 晶系 | Isometric |
| 雙晶 | 111 rare |
| 解理 | 111 indistinct, may be a parting. |
| 斷口 | Subconchoidal to uneven, splintery |
| 韌性/脆性 | 脆 |
| 莫氏硬度 | 5.0–5.5 |
| 光澤 | Vitreous to resinous |
| 條痕 | 白 |
| 透明性 | Subtranslucent to opaque |
| 比重 | 4.45 to 4.90 |
| 光學性質 | Isotropic, weak anomalous anisotropism |
| 折射率 | n = 1.9–2.2 |
| 其他特徵 | Variably radioactive, often metamict |
| 參考文獻 | [1][2][3][4] |
燒綠石也是通式為A2B2O7（其中A和B均為金屬）的晶體的結構。
發現
燒綠石最初於1826年於Stavern (Fredriksvärn), Larvik, Vestfold, Norway發現，其名稱源於古希臘語的πῦρ「火」和χλωρός「綠色」——它在經典吹管分析中燃燒會變綠。[3]
參考文獻
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